Improvement in circuit-breakers for electro-magnetic burglar-alarms



2 Sheets-Sheet 1. J. J. BRADLEY.

Circuit-Breakers for EleotrO-Magnetio Burg1ar-A1arn1s No. 196,557 Patented Oct. 30,1877.

N. PETERS, FHOTO LITNOGRAPHER WASHINGTON D C.

2 Sheets-Sheet 2.

- I J. J. BRADLEY. Circuit-Breakers for Electro-Magnetic Burglar-Alarl'ng No. 196,557 Patented Oct. 30,1877.

UNITED STATES PATENT OFFICE.

JAMES J. BRADLEY,'OF NEWARK, NEW JERSEY, ASSIGNOR TO GEORGE IV.

HUBBELL, ENOS RUNYON, JABEZ PLACE.

FEAREY, AND F. T. FEAREY, OF SAME IMPROVEMENT IN CIRCUIT-BREAKERS FOR ELECTRO-MAGNETIC BURGLAR-ALARMS.

Specification forming part of Letters Patent No. 196,557, dated October 30, 1877; application filed August 22, 1877.

transmitter that is brought into action by the opening of a door or window to give a signal at a central ofiice or police-station in addition to ringing an alarm, and the signal will be correctly given, even when the door or window is instantly closed again.

In the drawings, Figure 1 is a general View illustrative of the circuitrconnections. Fig. 2 is a section 0 "the transmitter, and Fig. 3 is a plan of the same. Fig. 4 is a section of the window springcircuit closer.

The recording instrument a is located at a central oflice or police-station, at which there is also a main battery, b, and earth-connection E. The line extends to any desired number of places, and at each there is a signaling-box of'any desired character adapted to the call of messenger, or police, or firemen, as usual in what are known as district-telegraphs3 The instrument of this character is illustrated at D, and, as a chemical recorder and a districttelegraph are shown and described in Patent N 0. 169,972, November 16, 187 5, and the same can be used in connection with the present improvements, it is not necessary to furnish any further detailed description.

By placing a magnet, c, in a shunt around the chemical recorder a, the same operates as a relay to the sounder s when the message or signal is to be received by sound or attention shaft, 6,. in the train of gearing or clock-movecalled to the signal.

At the building containing the burglaralarm there is a battery, f, and the circuitconnections, as usual; but the circuit-closer at the door is different from those usually employed. It consists of a lever, g, and spring h, by which the end of the lever g is kept in contact with the peg z, and the circuit closed in the normal position. The other end of the lever is over the edge or top of the door I,

so that the door comes into contact therewith as it is opened, and the lever is thereby moved away from t and the circuit broken.

To provide for closing the door and to prevent the circuit being broken in closing the door, I make use of a swinging detent, It, at the end of the lever,'united thereto bya knucklejoint, and provided with a spring, so that the detent only will be moved as the door is shut, and both detent and lever will be moved as it is opened, and the signal will only be given upon opening the door.

The window-spring consists of a springbolt, 0, within a metal case, the end of which is rounded and rubs against the edge of the sash, and there is a double inclined or curved notch at 2 in the edge of the sash 0 ,hence this-bolt will only move forward in its case when the notch of the sash passes its end. There is an insulated spring, 1', adjacent to the bolt and in contact therewith when the window is closed, so that the circuit is completed through the bolt and spring, the wires being connected respectively to the said bolt and spring; but when the bolt is projected by its spring into the notch of the sash, the circuit is broken to give the alarm or signal by the end of the bolt separating from the circuit-closing spring.

In order to give a signal at the central station indicating the building in which the circuit has been broken'a transmitting-instrument, T, is employed in each building. The same contains a magnet, t, in the local circuit of the battery f; hence the armature 3 is held down by the magnet until the circuit is broken by the opening of a door or window. This armature 3 has a lever with stop 4 at one end. This engages a stud, 5, upon a wheel and ment of the transmitting-instrument. Upon the same shaft 6 is an arm, 8, and spring circuit-closer 9 at its end, and there is a stationary insulated signal-ring, 02, around the shaft 6, and the main line of the district circuit is connected by a branch, 10, to the trans mitter T and the signal-ring o by a wire to earth E. The edges of thissignal-ring are notched, so as to leave groups of projections i I I I a 1 or character by w is designated cc, and the circorresponding to the number which the particular buildi and known at the central 0 wit-closing spring either projection of 0 when at rest. Hence the circuit through the transmitter remains broken when in anormal position; but as soon as a window or door is opened the local circuit is broken and the magnet t allows its armature 3 to be drawn back by its spring, liberating the train of clock-work or gearing, and causing the arm and transmitting circuitcloser to revolve around the ring and indicate the location of the burglary at the central station. When the door or window is closed the circuit. is completed and the signal ceases. Until this is done a hell or alarm is rung upon 9 is not in contact with JAMES J. BRADLEY.

. Witnesses ABRAHAM MANNERS, J. T. MURRAY. 

